Inclusive Positive-Pion Production in Antiproton-Neutron Interactions at 3.5 GeV/c

Abstract

The inclusive reactions $\overline{p}n\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}X$, $2{\ensuremath{\pi}}^{+}X$ have been studied at 3.5 GeV/c in a bubble-chamber experiment. In the absence of high-energy data, no test of scaling was performed; however, the longitudinal- and transverse-momentum distributions are qualitatively similar to other "exotic" reactions at medium-high energies (12-24 GeV). To facilitate compilations the data have been parametrized empirically in terms of $x$ and ${p}_{T}$. The two-particle longitudinal-momentum distributions also show familiar behavior, and a strong positive correlation appears at ${x}_{c}\ensuremath{\simeq}{x}_{d}\ensuremath{\simeq}0$. The ${\ensuremath{\pi}}^{+}$ energy distribution agrees remarkably well with simple thermodynamic functions, but our statistics do not allow us to distinguish between Boltzmann and Bose-Einstein forms.